Snapdragon, any herbaceous plant of the genusAntirrhinum (order Lamiales, family Plantaginacea; formerly in the family Scrophulariaceae), of which there are about 20 species native to western North America and the western Mediterranean region. The flowers are tubular, bilaterally symmetrical, and usually large with a closed, liplike mouth that excludes most insects but can be forced open by strong bees, the main pollinators.

Common snapdragon (Antirrhinum majus)

Carlo Bevilacqua—SCALA/Art Resource, New York

Snapdragons are popular garden plants, and many horticultural varieties exist. Galvezia speciosa, a related plant, is also called snapdragon.

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...whorl make the flower irregular (as in the canna and Asiatic dayflower). When a flower can be divided by a single plane into two equal parts, it is zygomorphic, or bilaterally symmetrical, as in the snapdragon, orchid, and sweet pea.